Sudden loss of thermal stability in Fe-based nanocrystalline alloys

The inherent instability of nanocrystalline materials with respect to grain growth can be mitigated by adding an atomic species that segregates to the grain boundaries. Our investigations of binary Fe-based alloys show that this method is effective in stabilizing the nanocrystalline state, but only...

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Bibliographic Details
Published in:Scripta materialia 2012-03, Vol.66 (6), p.390-393
Main Authors: Dake, Jules M., Krill, Carl E.
Format: Article
Language:English
Subjects:
Abnormal grain growth
Alloys
Diffraction
Ferrous alloys
Focused ion beam (FIB) microscopy
Grain boundaries
Grain growth
Iron alloys
Nanocrystalline materials
Nanocrystals
Stability
Transformations
X-ray diffraction (XRD)
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Summary:The inherent instability of nanocrystalline materials with respect to grain growth can be mitigated by adding an atomic species that segregates to the grain boundaries. Our investigations of binary Fe-based alloys show that this method is effective in stabilizing the nanocrystalline state, but only up to about 900 °C. Above this threshold, microstructural stability is suddenly lost. In situ X-ray diffraction measurements incriminate the α-to- γ transformation, and focused ion beam microscopy reveals a growth morphology reminiscent of abnormal grain growth.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2011.11.040